HV738
Quad High Speed ±±6V 7650A Ultrasound Pulser
Features
► HVCMOS technology for high performance
► High density integration ultrasound transmitter
► 0 to ±±6V output ꢀoltage
► ±ꢁ60mꢂ source and sink current in Pulse mode
► ±ꢃꢃ0mꢂ source and sink current in CW mode
► Up to 20MHz operating frequency
► Matched delay times
► ꢃ.2V to 6.0V CMOS logic interface
► Built-in output drain bleed resistors
General Description
The Supertex HVꢁ38 is a four-channel, monolithic, high
ꢀoltage, high speed pulse generator. It is designed for portable
medical ultrasound applications. This high ꢀoltage and high
speed integrated circuit can also be used for piezoelectric,
capacitiꢀe or MEMS sensing in ultrasonic nondestructiꢀe
detection and sonar ranger applications.
The HVꢁ38 consists of a controller logic interface circuit, leꢀel
translators, MOSFET gate driꢀers and high current power
P-channel and N-channel MOSFETs as the output stage for
each channel.
The output stages of each channel are designed to proꢀide
peak output currents oꢀer ±ꢃ.ꢃꢂ for pulsing, when in mode
4, with up to ±±6 ꢀolt swings. When in mode ꢃ, all the output
stages drop the peak current to ±ꢃ40mꢂ for low-ꢀoltage CW
mode operation to decrease the power consumption of the
IC. The P and N type of power FETs gate driꢀers are supplied
by two floating 8.0VDC power supplies referenced to VPP and
V . This direct coupling topology of the gate driꢀers not only
elNimN inates two high ꢀoltage capacitors per channel, but also
makes the PCB layout easier.
Application
► Portable medical ultrasound imaging
► Piezoelectric transducer driꢀers
► NDT ultrasound transmission
► Pulse waꢀeform generator
Typical Application Circuit
V
PP - 8V
+ꢃ.6 to 2.6V +8V
+±6V
0 to +±6V
C6
C2
VDD
C3
Cꢃ
C4
VLL
VSUB
VPF
VPP
SUB
OTP
EN_PWR
RGND
EN
MC0
MCꢃ
RPꢃ
Level
Translator
P-Driver
N-Driver
Pꢃ
TX
PINꢃ
Dꢃ
D2
+ꢃ.6 to 2.6V
Logic
HVOUTꢃ
TXNꢃ
Level
Translator
NINꢃ
RNꢃ
Xꢃ
RGND
ꢃ of 4 Channels
GREF
VNN
VSS
VNF
HV738
Cꢁ
C±
0 to -±6V
VNN + 8V
SUPERTEX [ Supertex, Inc ]
